In thermodynamics of solid materials, pressure is often considered negligible, especially in cases where the solid is in a vacuum, leading to a pressure of zero. However, internal pressure can exist and is influenced by the material's internal structure. The significance of pressure becomes more relevant in extreme conditions, such as within the Earth's core. Overall, for most solid materials, pressure does not play a crucial role in thermodynamic descriptions. Understanding these dynamics is essential for studying materials under varying environmental conditions.